Datasheet

V850ES/JG3-H, V850ES/JH3-H CHAPTER 20 CAN CONTROLLER

R01UH0042EJ0500 Rev.5.00 Page 1027 of 1513

Aug 12, 2011

Figure 20-46. Transmission Abort Processing (Other Than in Normal Operation Mode with ABT)

START

Yes

END

Clear TRQ bit.

Set TRQ bit = 0

Clear TRQ bit = 1

TSTAT bit = 0?

Wait for a period of 11 CAN

data bits

Note

Yes

Read C0LOPT register.

Message buffer to

be aborted matches

C0LOPT register?

Transmission successful

Transmit abort request

was successful.

Note During a period of a total of 11 bits, 3 bits of interframe space and 8 bits of suspend transmission, the

transmission request may have already been acknowledged by the protocol layer. Consequently,

transmission may not be aborted but started even if the TRQ bit is cleared.

Cautions 1. Execute transmission abort processing by clearing the TRQ bit, not the RDY bit.

2. Before making a sleep mode transition request, confirm that there is no transmission

request left using this processing.

3. The TSTAT bit can be periodically checked by a user application or can be checked after

the transmit completion interrupt.

4. Do not execute a new transmission request that includes other message buffers while

transmission abort processing is in progress.

5. If data of the same message buffer are successively transmitted or if only one message

buffer is used, judgments whether transmission has been successfully executed or failed

may contradict. In such a case, make a judgment by using the history information of the

C0TGPT register.